已知5siny=sin(2x+y),求证:tan(x+y)=3/2tanx

已知5siny=sin(2x+y),求证:tan(x+y)=3/2tanx 已知sin(2x+y)=5siny,(y不等于K派),求证;3tan=2tan(x+y) 已知：3sinY=sin(2X+Y),求证tan(X+Y)=2tanX 求解一道三角函数体已知sin(2x+y)=5siny,求证2tan(x+y)=3tanx. 求证：sin(2x+y)/sinx-2cos(x+y)=siny/sinx(2)已知5siny=sin(2x+y),求证:tan(x+y)=3/2 tanx 3tanx=2tan(2x+y) 求证：sin（2x+y）=5siny 求证sinx+siny=2sin(x+y)/2*cos(x-y)/2 求证:sinx+siny=2sin(x+y)/2cos(x-y)/2 求证|sinx-siny|=|2sin[(x-y)/2]cos[(x+y)/2]| 求证sin（2x+y)/sinx-2cos(x+y)=siny/sinx 求证：sin(2x+y)/sinx-2cos(x+y)=siny/sinx 已知cosa=cosx*siny,cosb=sinx*siny求证：sin^2a+sin^2b+sin^2y=2 已知cos(x+y)cosy+sin(x+y)siny=4/5,求tanx的值 已知(sinx)2-(siny)2=m求sin(x y)sin(x-y)求sin(x+y)sin(x-y) 若tan（x+y）=2tanx,求证3siny=sin（2x+y）. 1.已知8cos(2x+y)+5cosy=0,求tan(x+y)*tanx的值.2.已知关于x的方程x^2+px+q=0的两根是tanx,tany,求sin(x+y)/cos(x-y)的值.3.化简:sin(x-y)/(sinx*siny)+sin(y-z)/(siny*sinz)+sin(z-x)/(sinz*sinx). 已知x-y=派/3,且sin x-siny=1/2,求cos(x+y). 证明sin(x+y)sin(x-y)=sinx-siny